Start with mapping out user flow before coding the front-end web app using tools like Figma or simple sketches.Select a scalable tech stack like React or Vue, Vite for bundling, Tailwind CSS for styling, and Zustand or Redux for state management.Emphasize modular components for better organization by breaking UI into testable, reusable pieces following specific folder structures.Prioritize performance by lazy loading routes and images, using local fonts and SVGs, and analyzing performance with tools like Lighthouse.Ensure accessibility by using semantic HTML, enabling keyboard navigation, and testing with screen readers to make the front-end web app inclusive.